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Water Quality Problem

Water Quality Problem – High hardness/minerals or incorrect antifreeze

Viessmann · Vitodens 200-W B2HA Boiler

What does Water Quality Problem mean?

Poor water quality, characterized by high mineral content or hardness, can lead to scaling and corrosion within the boiler. Additionally, using unapproved or automotive silicate-based antifreeze can damage system components.

Common Causes

  • Untreated boiler feed water with high mineral content
  • Use of automotive or unapproved antifreeze products
  • Exceeding the recommended 50% antifreeze concentration
  • Insufficient monitoring of water chemistry

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Have the boiler system water tested for hardness and mineral content.

  2. 2

    If antifreeze is present, verify it is specifically designed for hot water heating systems and not automotive type.

  3. 3

    Ensure antifreeze concentration does not exceed 50% and monitor it regularly.

  4. 4

    If water quality is poor, consult a heating professional for water treatment options or to flush and refill the system with appropriate fluids.

  5. 5

    Inform the system operator/owner if a glycol mix is used and provide safety data sheets.

Browse all codes in this manual (8)
Verified technical data. Last updated: April 2026

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Source: Viessmann Vitodens 200-W B2HA Boiler
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